Electronic storage battery diagnostic system

ABSTRACT

A battery diagnostic system including Kelvin connectors configured to electrically couple to a storage battery. A forcing function source is configured to apply a forcing function signal to the storage battery through the Kelvin connectors. Measurement circuitry calculates an electrical parameter of the storage battery. A memory stores a plurality of electrical parameters for a plurality of storage batteries and each of the plurality of stored electrical parameters is associated with storage battery identifier information which identifies one of the storage batteries of the plurality of storage batteries and time information, which identifies a time the electrical parameter was obtained.

CROSS-REFERENCE TO RELATED APPLICATION

The present application is based on and claims the benefit of U.S. provisional patent application Ser. No. 61/348,901, filed May 27, 2010, the content of which is hereby incorporated by reference in its entirety.

BACKGROUND

The present invention relates to testing storage batteries. More specifically, the present invention relates diagnosing problems associated with such storage batteries.

Storage batteries have widespread application across many industries. Some storage batteries are used in automotive vehicles. For example, storage batteries are used in vehicles in internal combustion engines to start the engine, power electronics of the vehicle, and even assisting moving the vehicle in the case of a hybrid vehicle. An all-electric vehicle includes a large storage battery used to store electrical energy to power electrical motors of the vehicle. Other applications of storage batteries include backup power supply batteries. For example, such backup power supply batteries used to provide power to cellular phone sites during power outages, power substations for the distribution of electrical power, etc.

It is desirable to determine the condition of a storage battery. The condition information can be used to predict the remaining life in to battery, determine whether a battery should be replaced, determining how much power the battery is capable of storing, etc. One typical battery storage technique is to measure a parameter of the battery which is related to its condition and compare that parameter with a rated value for the battery. Examples of battery testing techniques and related technologies are described in U.S. Pat. No. 3,873,911, issued Mar. 25, 1975, to Champlin; U.S. Pat. No. 3,909,708, issued Sep. 30, 1975, to Champlin; U.S. Pat. No. 4,816,768, issued Mar. 28, 1989, to Champlin; U.S. Pat. No. 4,825,170, issued Apr. 25, 1989, to Champlin; U.S. Pat. No. 4,881,038, issued Nov. 14, 1989, to Champlin; U.S. Pat. No. 4,912,416, issued Mar. 27, 1990, to Champlin; U.S. Pat. No. 5,140,269, issued Aug. 18, 1992, to Champlin; U.S. Pat. No. 5,343,380, issued Aug. 30, 1994; U.S. Pat. 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No. 12/498,642, filed Jul. 7, 2009, entitled ELECTRONIC BATTERY TESTER; U.S. Ser. No. 12/697,485, filed Feb. 1, 2010, entitled ELECTRONIC BATTERY TESTER; U.S. Ser. No. 12/698,375, filed Feb. 2, 2010, entitled ELECTRONIC BATTERY TESTER; U.S. Ser. No. 12/712,456, filed Feb. 25, 2010, entitled METHOD AND APPARATU FOR DETECTING CELL DETERIORATION IN AN ELECTROCHEMICAL CELL OR BATTERY; U.S. Ser. No. 61/311,485, filed Mar. 8, 2010, entitled BATTERY TESTER WITH DATABUS FOR COMMUNICATING WITH VEHICLE ELECTRICAL SYSTEM; U.S. Ser. No. 61/313,893, filed Mar. 15, 2010, entitled USE OF BATTERY MANUFACTURE/SELL DATE IN DIAGNOSIS AND RECOVERY OF DISCHARGED BATTERIES; U.S. Ser. No. 12/758,407, filed Apr. 12, 2010, entitled ELECTRONIC BATTERY TESTER WITH NETWORK COMMUNICATION; U.S. Ser. No. 12/765,323, filed Apr. 22, 2010, entitled AUTOMOTIVE VEHICLE ELECTRICAL SYSTEM DIAGNOSTIC DEVICE; U.S. Ser. No. 12/769,911, filed Apr. 29, 2010, entitled STATIONARY BATTERY TESTER; U.S. Ser. No. 61/330,497, filed May 3, 2010, entitled MAGIC WAND WITH ADVANCED HARNESS DETECTION; U.S. Ser. No. 12/774,892, filed May 6, 2010, entitled SCAN TOOL FOR ELECTRONIC BATTERY TESTER; U.S. Ser. No. 12/786,890, filed May 25, 2010, entitled BATTERY TESTER WITH PROMOTION FEATURE; U.S. Ser. No. 61/348,901, filed May 27, 2010, entitled ELECTRTONIC BATTERY TESTER; U.S. Ser. No. 29/362,827, filed Jun. 1, 2010, entitled ELECTRONIC BATTERY TESTER; U.S. Ser. No. 61/351,017, filed Jun. 3, 2010, entitled IMPROVED ELECTRIC VEHICLE AND HYBRID ELECTRIC VEHICLE BATTERY MODULE BALANCER; U.S. Ser. No. 12/818,290, filed Jun. 18, 2010, entitled BATTERY MAINTENANCE DEVICE WITH THERMAL BUFFER; U.S. Ser. No. 61/373,045, filed Aug. 12, 2010, entitled ELECTRONIC BATTERY TESTER FOR TESTING STATIONERY STORAGE BATTERY; U.S. Ser. No. 12/888,689, filed Sep. 23, 2010, entitled BATTERY TESTER FOR ELECTRIC VEHICLE; U.S. Ser. No. 12/894,951, filed Sep. 30, 2010, entitled BATTERY PACK MAINTENANCE FOR ELECTRIC VEHICLES; U.S. Ser. No. 61/411,162, filed Nov. 8, 2010, entitled ELECTRONIC BATTERY TESTER; U.S. Ser. No. 13/037,641, filed Mar. 1, 2011, entitled MONITOR FOR FRONT TERMINAL BATTERIES; which are incorporated herein by reference in their entirety.

SUMMARY

A battery diagnostic system including Kelvin connectors configured to electrically couple to a storage battery. A forcing function source is configured to apply a forcing function signal to the storage battery through the Kelvin connectors. Measurement circuitry calculates an electrical parameter of the storage battery. A memory stores a plurality of electrical parameters for a plurality of storage batteries and each of the plurality of stored electrical parameters is associated with storage battery identifier information which identifies one of the storage batteries of the plurality of storage batteries and time information, which identifies a time the electrical parameter was obtained.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a simplified block diagram of a battery diagnostic system in accordance with one example embodiment.

FIG. 2 is a simplified block diagram illustrating steps in obtaining battery measurements in accordance with one example embodiment.

FIG. 3 is a simplified block diagram showing the determination of diagnostics in accordance with one example embodiment of the present invention.

FIG. 4 is a simplified block diagram showing the determination of diagnostics in accordance with another example embodiment of the present invention

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

The present invention provides a diagnostic system for diagnosing condition of one or more batteries. In various configurations, the present invention does not rely on a predetermined rating for a particular battery under test. The diagnostic system obtains a plurality of measurement from one or more of batteries. The measurements comprise an electrical parameter of a battery under test. The electrical parameters are stored in a memory along with information which identifies which battery the parameter is associated with along with time information related to when the parameter was measured. This information can be used to establish a baseline rating for a battery as well as monitor rapid changes in the measured parameter over time.

FIG. 1 is a simplified block diagram of one example embodiment of the present invention. In FIG. 1, a battery diagnostic system 102 is illustrated which is configured to diagnose a condition of batteries 102A, 102B . . . 102N. Diagnostic system 100 couples to batteries 102A-102N through a multiplexor 104. Multiplexor 104 is used to couple Kelvin connectors 106A/108A, 106B/108B . . . 106N/108N to batteries 102A, 102B . . . 102N, respectively. In one configuration, the batteries illustrated in FIG. 1 are part of a power source for powering equipment. For example, the batteries may be used as backup power supply to power computing equipment, a cellular phone site, an electric substation, transportation control equipment, etc. Although a plurality of batteries are illustrated in FIG. 1, in some configurations a single battery is employed. Further, the battery (or batteries) may be part of a vehicle either a conventional automotive vehicle using an internal combustion engine, a hybrid vehicle using both battery power and fossil fuel power or a pure electric vehicle.

Battery diagnostic system 100 measures electrical parameters of the batteries 102A-N by applying a forcing function signal from a forcing function source 110. The forcing function from forcing function 110 is applied to the batteries through Kelvin connectors 106/108. A particular battery 102 is selected using multiplexor 104. The resultant signal across the terminals of the battery is measured using differential amplifier 112. The measured signal is digitized from analog to digital converter 116 and provided to microprocessor 114. Microprocessor operates in accordance with instructions stored in memory 120. Further, microprocessor stores measured parameter in memory 120. Microprocessor 114 also couples to a clock 122 which can be used to maintain time related information. For example, a time at which a particular parameter is measured may be stored in memory 120, along with information which identifies which of the batteries the measurement was obtained from.

The diagnostic system 100 can be configured to communicate with a remote location using input/output circuitry 124. This may be a wired connection to another location, a wireless connection, a network connection, etc. Optionally, a local user input/output 126 is provided for controlling operation of the diagnostic system 100, updating parameters within the system 100, viewing test results, receiving alarm information, etc.

The system 100 can measure any electrical parameter of the batteries 102. In one specific example, the measured parameter comprises a dynamic parameter in which the forcing unction includes a time varying component including transient as well as periodic components. The forcing function can be large or small relative to the voltage of the battery 102 or the current flowing through the battery 102. The resultant signal (i.e. voltage) change across terminals of a battery is measured using amplifier 112. The forcing function can be active source in which power is applied to the battery, for example, using a transistor driven source. Similarly, the forcing function may comprise a passive source which power is drawn from the battery, for example using such as a load resistance, etc. The forcing function signal can be any signal having a time varying component including periodic and transient signals. Microprocessor 114 can calculate a dynamic parameter based upon the forcing function and the measured response. For example, dynamic conductance can be calculated as follows: ΔG−ΔI/ΔV  Equation 1 Other examples include dynamic resistance, impedance, susceptance, admittance, etc. Examples of dynamic parameter measurements and related technology are shown in and described in U.S. Pat. No. 3,873,911, issued Mar. 25, 1975, to Champlin; U.S. Pat. No. 3,909,708, issued Sep. 30, 1975, to Champlin; U.S. Pat. No. 4,816,768, issued Mar. 28, 1989, to Champlin; U.S. Pat. No. 4,825,170, issued Apr. 25, 1989, to Champlin; U.S. Pat. No. 4,881,038, issued Nov. 14, 1989, to Champlin; U.S. Pat. No. 4,912,416, issued Mar. 27, 1990, to Champlin; U.S. Pat. No. 5,140,269, issued Aug. 18, 1992, to Champlin; U.S. Pat. No. 5,343,380, issued Aug. 30, 1994; U.S. Pat. No. 5,572,136, issued Nov. 5, 1996; U.S. Pat. No. 5,574,355, issued Nov. 12, 1996; U.S. Pat. No. 5,583,416, issued Dec. 10, 1996; U.S. Pat. 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No. 09/862,783, filed May 21, 2001, entitled METHOD AND APPARATUS FOR TESTING CELLS AND BATTERIES EMBEDDED IN SERIES/PARALLEL SYSTEMS; U.S. Ser. No. 09/880,473, filed Jun. 13, 2001; entitled BATTERY TEST MODULE; U.S. Ser. No. 10/042,451, filed Jan. 8, 2002, entitled BATTERY CHARGE CONTROL DEVICE; U.S. Ser. No. 10/109,734, filed Mar. 28, 2002, entitled APPARATUS AND METHOD FOR COUNTERACTING SELF DISCHARGE IN A STORAGE BATTERY; U.S. Ser. No. 10/112,998, filed Mar. 29, 2002, entitled BATTERY TESTER WITH BATTERY REPLACEMENT OUTPUT; U.S. Ser. No. 10/263,473, filed Oct. 2, 2002, entitled ELECTRONIC BATTERY TESTER WITH RELATIVE TEST OUTPUT; U.S. Ser. No. 10/310,385, filed Dec. 5, 2002, entitled BATTERY TEST MODULE; U.S. Ser. No. 09/653,963, filed Sep. 1, 2000, entitled SYSTEM AND METHOD FOR CONTROLLING POWER GENERATION AND STORAGE; U.S. Ser. No. 10/174,110, filed Jun. 18, 2002, entitled DAYTIME RUNNING LIGHT CONTROL USING AN INTELLIGENT POWER MANAGEMENT SYSTEM; U.S. Ser. No. 10/258,441, filed Apr. 9, 2003, entitled CURRENT MEASURING CIRCUIT SUITED FOR BATTERIES; U.S. Ser. No. 10/681,666, filed Oct. 8, 2003, entitled ELECTRONIC BATTERY TESTER WITH PROBE LIGHT; U.S. Ser. No. 10/791,141, filed Mar. 2, 2004, entitled METHOD AND APPARATUS FOR AUDITING A BATTERY TEST; U.S. Ser. No. 10/867,385, filed Jun. 14, 2004, entitled ENERGY MANAGEMENT SYSTEM FOR AUTOMOTIVE VEHICLE; U.S. Ser. No. 10/958,812, filed Oct. 5, 2004, entitled SCAN TOOL FOR ELECTRONIC BATTERY TESTER; U.S. Ser. No. 60/587,232, filed Dec. 14, 2004, entitled CELLTRON ULTRA, U.S. Ser. No. 60/653,537, filed Feb. 16, 2005, entitled CUSTOMER MANAGED WARRANTY CODE; U.S. Ser. No. 60/665,070, filed Mar. 24, 2005, entitled OHMMETER PROTECTION CIRCUIT; U.S. Ser. No. 60,694,199, filed Jun. 27, 2005, entitled GEL BATTERY CONDUCTANCE COMPENSATION; U.S. Ser. No. 60/705,389, filed Aug. 4, 2005, entitled PORTABLE TOOL THEFT PREVENTION SYSTEM, U.S. Ser. No. 11/207,419, filed Aug. 19, 2005, entitled SYSTEM FOR AUTOMATICALLY GATHERING BATTERY INFORMATION FOR USE DURING BATTERY TESTER/CHARGING, U.S. Ser. No. 60/712,322, filed Aug. 29, 2005, entitled AUTOMOTIVE VEHICLE ELECTRICAL SYSTEM DIAGNOSTIC DEVICE, U.S. Ser. No. 60/713,168, filed Aug. 31, 2005, entitled LOAD TESTER SIMULATION WITH DISCHARGE COMPENSATION, U.S. Ser. No. 60/731,881, filed Oct. 31, 2005, entitled PLUG-IN FEATURES FOR BATTERY TESTERS; U.S. Ser. No. 60/731,887, filed Oct. 31, 2005, entitled AUTOMOTIVE VEHICLE ELECTRICAL SYSTEM DIAGNOSTIC DEVICE; U.S. Ser. No. 11/304,004, filed Dec. 14, 2005, entitled BATTERY TESTER THAT CALCULATES ITS OWN REFERENCE VALUES; U.S. Ser. No. 60/751,853, filed Dec. 20, 2005, entitled BATTERY MONITORING SYSTEM; U.S. Ser. No. 11/304,004, filed Dec. 14, 2005, entitled BATTERY TESTER WITH CALCULATES ITS OWN REFERENCE VALUES; U.S. Ser. No. 60/751,853, filed Dec. 20, 2005, entitled BATTERY MONITORING SYSTEM; U.S. Ser. No. 11/356,443, filed Feb. 16, 2006, entitled ELECTRONIC BATTERY TESTER WITH NETWORK COMMUNICATION; U.S. Ser. No. 11/519,481, filed Sep. 12, 2006, entitled BROAD-BAND LOW-CONDUCTANCE CABLES FOR MAKING KELVIN CONNECTIONS TO ELECTROCHEMICAL CELLS AND BATTERIES; U.S. Ser. No. 60/847,064, filed Sep. 25, 2006, entitled STATIONARY BATTERY MONITORING ALGORITHMS; U.S. Ser. No. 11/641,594, filed Dec. 19, 2006, entitled METHOD AND APPARATUS FOR MEASURING A PARAMETER OF A VEHICLE ELECTRONIC SYSTEM; U.S. Ser. No. 60/950,182, filed Jul. 17, 2007, entitled BATTERY TESTER FOR HYBRID VEHICLE; U.S. Ser. No. 60/973,879, filed Sep. 20, 2007, entitled ELECTRONIC BATTERY TESTER FOR TESTING STATIONARY BATTERIES; U.S. Ser. No. 11/931,907, filed Oct. 31, 2007, entitled BATTERY MAINTENANCE WITH PROBE LIGHT; U.S. Ser. No. 60/992,798, filed Dec. 6, 2007, entitled STORAGE BATTERY AND BATTERY TESTER; U.S. Ser. No. 61/061,848, filed Jun. 16, 2008, entitled KELVIN CLAMP FOR ELECTRONICALLY COUPLING TO A BATTERY CONTACT; U.S. Ser. No. 12/168,264, filed Jul. 7, 2008, entitled BATTERY TESTERS WITH SECONDARY FUNCTIONALITY; U.S. Ser. No. 12/174,894, filed Jul. 17, 2008, entitled BATTERY TESTER FOR ELECTRIC VEHICLE; U.S. Ser. No. 12/204,141, filed Sep. 4, 2008, entitled ELECTRONIC BATTERY TESTER OR CHARGER WITH DATABUS CONNECTION; U.S. Ser. No. 12/328,022, filed Dec. 4, 2008, entitled STORAGE BATTERY AND BATTERY TESTER; U.S. Ser. No. 12/416,457, filed Apr. 1, 2009, entitled SYSTEM FOR AUTOMATICALLY GATHERING BATTERY INFORMATION; U.S. Ser. No. 12/416,453, filed Apr. 1, 2009, entitled INTEGRATED TAG READER AND ENVIRONMENT SENSOR; U.S. Ser. No. 12/416,445, filed Apr. 1, 2009, entitled SIMPLIFICATION OF INVENTORY MANAGEMENT; U.S. Ser. No. 12/485,459, filed Jun. 16, 2009, entitled CLAMP FOR ELECTRONICALLY COUPLING TO A BATTERY CONTACT; U.S. Ser. No. 12/498,642, filed Jul. 7, 2009, entitled ELECTRONIC BATTERY TESTER; U.S. Ser. No. 12/697,485, filed Feb. 1, 2010, entitled ELECTRONIC BATTERY TESTER; U.S. Ser. No. 12/698,375, filed Feb. 2, 2010, entitled ELECTRONIC BATTERY TESTER; U.S. Ser. No. 12/712,456, filed Feb. 25, 2010, entitled METHOD AND APPARATU FOR DETECTING CELL DETERIORATION IN AN ELECTROCHEMICAL CELL OR BATTERY; U.S. Ser. No. 61/311,485, filed Mar. 8, 2010, entitled BATTERY TESTER WITH DATABUS FOR COMMUNICATING WITH VEHICLE ELECTRICAL SYSTEM; U.S. Ser. No. 61/313,893, filed Mar. 15, 2010, entitled USE OF BATTERY MANUFACTURE/SELL DATE IN DIAGNOSIS AND RECOVERY OF DISCHARGED BATTERIES; U.S. Ser. No. 12/758,407, filed Apr. 12, 2010, entitled ELECTRONIC BATTERY TESTER WITH NETWORK COMMUNICATION; U.S. Ser. No. 12/765,323, filed Apr. 22, 2010, entitled AUTOMOTIVE VEHICLE ELECTRICAL SYSTEM DIAGNOSTIC DEVICE; U.S. Ser. No. 12/769,911, filed Apr. 29, 2010, entitled STATIONARY BATTERY TESTER; U.S. Ser. No. 61/330,497, filed May 3, 2010, entitled MAGIC WAND WITH ADVANCED HARNESS DETECTION; U.S. Ser. No. 12/774,892, filed May 6, 2010, entitled SCAN TOOL FOR ELECTRONIC BATTERY TESTER; U.S. Ser. No. 12/786,890, filed May 25, 2010, entitled BATTERY TESTER WITH PROMOTION FEATURE; U.S. Ser. No. 61/348,901, filed May 27, 2010, entitled ELECTRONIC BATTERY TESTER; U.S. Ser. No. 29/362,827, filed Jun. 1, 2010, entitled ELECTRONIC BATTERY TESTER; U.S. Ser. No. 61/351,017, filed Jun. 3, 2010, entitled IMPROVED ELECTRIC VEHICLE AND HYBRID ELECTRIC VEHICLE BATTERY MODULE BALANCER; U.S. Ser. No. 12/818,290, filed Jun. 18, 2010, entitled BATTERY MAINTENANCE DEVICE WITH THERMAL BUFFER; U.S. Ser. No. 61/373,045, filed Aug. 12, 2010, entitled ELECTRONIC BATTERY TESTER FOR TESTING STATIONERY STORAGE BATTERY; U.S. Ser. No. 12/888,689, filed Sep. 23, 2010, entitled BATTERY TESTER FOR ELECTRIC VEHICLE; U.S. Ser. No. 12/894,951, filed Sep. 30, 2010, entitled BATTERY PACK MAINTENANCE FOR ELECTRIC VEHICLES; U.S. Ser. No. 61/411,162, filed Nov. 8, 2010, entitled ELECTRONIC BATTERY TESTER; U.S. Ser. No. 13/037,641, filed Mar. 1, 2011, entitled MONITOR FOR FRONT TERMINAL BATTERIES; which are incorporated herein by reference in their entirety.

FIG. 2 is simplified block diagram 150 illustrating steps in accordance with one example embodiment of the present invention. In the method illustrated in FIG. 2, the procedures initiated at start block 152. The various blocks and elements discussed in connection with FIG. 2 may be implemented using any appropriate techniques, including, for example, the battery diagnostic system illustrated in FIG. 1. At block 154, a parameter of a battery is measured. At block 156 information which identifies the battery from which the battery was measured is obtained. This information may be obtained through any appropriate technique. For example, the information may be obtained based on a connection, a plurality of connections which are permanently coupled to batteries. For example, in FIG. 1, Kelvin connectors 106A, 108A can be used to identify battery 120A. This embodiment is functional so long as the same connectors remain coupled to the same battery, and, if a different is connected, the battery identification information is updated appropriately. Other examples embodiments include retrieving battery identification information directly from a battery 102. For example, this may be through a barcode, an RF ID tag, memory chip, etc. This information may be read, for example, using an optional I/O device. For example, user I/O device 126 shown in FIG. 1 may include a barcode scanner, an RF ID reader, etc. Other example embodiments include receiving battery information through the user I/O 126, for example, from an operator, receiving such information from another device, for example, though I/O 124 illustrated in FIG. 1.

At block 158, time information is obtained which indicates approximately the time at which the battery parameter was measured. At block 160, the measured parameter is stored in memory, for example, memory 120, along with the battery identification information and the time information. How this information is stored may be selected as desired. For example, the information may be stored in a “first in-first out” basis, or an overwrite configuration in which the oldest data is overwritten by new data. In other configurations, redundant data or data which is deemed to be of relatively low importance may be erased from the memory 120. For example, in one configuration, only one peak value of the measured parameter is maintained, the peak value can indicate a maximum performance level of the particular battery which has been measured. In addition, other information may be stored in the memory such as the temperature of the battery, what type of load is being placed on the battery from equipment that the battery is used to power, etc.

At block 162, diagnostics are performed based upon the measured battery parameter. As discussed in more detail below, these diagnostics can be based upon the information stored in previously stored. An output can be provided at memory 164 based upon the diagnostics. Optionally, the procedure can repeat. For example, after performing diagnostics at block 162, control can be returned to block 154 to obtain additional battery parameters. Similarly, control can be returned to block 154 from block 160 or block 164. In various embodiments, the battery parameter is obtained and stored periodically, for example, once a week, once a month, once a quarter, etc. Similarly, the battery parameter can be obtained based upon an input, for example, from a remote location or, from a user, based upon some event, etc.

FIG. 3 is a simplified block diagram showing one example diagnostic technique 200. In the block diagram illustrated in FIG. 3, the procedure starts at block 202. At block 204 a baseline value for the measured parameter is obtained. For example, the baseline parameter may be the maximum (or minimum) value of the parameter which has been measured for a particular battery or group of batteries. This information can be stored in memory, for example, memory 120. In one configuration, when performing the diagnostics, the microprocessor 114 review the data stored in the memory 120 and identifies the proper baseline parameter. In another example embodiment, the measured parameter is only written to a particular memory location if it is greater (or in some configurations less than) the previously measured parameter. The previously measured parameter is then overwritten with the new parameter. Thus, as the battery is charged and discharged, the baseline will be the “best” value for the particular parameter which has been measured. At block 206, the baseline parameter is compared to the most recently measured parameter of the particular battery. At block 208, the measured parameter and the baseline parameter are compared. In the illustrated example, the comparison is simply a percentage comparison. For example, if the measured parameter is within a certain percentage of the baseline parameter, the battery is deemed to be good and the diagnostics provides a pass result at block 210. Similarly, if the measured battery parameter is outside of the desired percentage, a fail output can be provided at block 212. Any type of comparison can be used between the baseline value and the measured value of the parameter. Another example includes a ration between the two quantities, a simple subtraction of the two quantities. Further, the results of the comparison do not need to be a simple pass/fail result. Other types of results may be determined such as an indication that the battery is failing, an expected amount of time until the battery ultimately fails, an indication of the severity of a failure, etc. For example, the ratio can be used to determine a state of health for the battery. Frequently, when a new battery is placed into service it has not reached its full potential. The batteries peak capabilities may be reached ninety or even one-hundred-eighty days from the installation as the battery experiences discharge and charge cycles.

FIG. 4 is a simplified block diagram 230 of another example embodiment of the present invention. In FIG. 4, the diagnostic system is initiated at start block 232 and a measurement from the battery is obtained at block 234. At block 236, one or more prior measurements from the same battery are obtained, for example, from memory 120 shown in FIG. 1. At block 238, a comparison is performed. This comparison is between any number of samples from a battery under test obtained over a period of time. At block 240, diagnostics are performed. For example, if a sudden change in the measured parameter is noted, this may be an indication that the battery is degrading rapidly. For example, if a rate of change of the measured parameter between measurements exceeds 5%, an output can be provided indicating that the battery is failing. In order to obtain a comparison which is based upon a rate of change, time information must be somehow included in the comparison. This time information can be time based information stored and associate with a particular test result. In another example embodiment, if battery measurements are taken at a regular interval, for example every week, then each successive measurement stored in the memory 120 will be one week apart thereby yielding time related information for use in determining rate of change. The rate of change determination can be based upon two sequential measurement, based upon multiple measurement and/or can be based upon measurements that are not sequential. The rate of change information can also be used to project the life span of the battery or determine an approximate time when the battery will need to be replaced.

Although the above description refers to a single battery, the various diagnostics can be performed on multiple batteries. Further, the measurement from one battery can be compared to data based upon measurements from multiple batteries.

Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may be made in form and detail without departing from the spirit and scope of the invention. In various embodiments, only some information may be stored in memory, for example, specific time information may not necessarily be required. 

What is claimed is:
 1. A battery diagnostic system, comprising: Kelvin connectors configured to electrically couple to a storage battery; a forcing function source configured to a forcing function signal to the storage battery through the Kelvin connectors; measurement circuitry calculating an electrical parameter of the storage battery; a memory storing a plurality of electrical parameters for each of a plurality of storage batteries, each of the plurality of stored electrical parameters associated with storage battery identification information which identifies one of the plurality of storage batteries and time information, which identifies a time the electrical parameter was obtained; diagnostic circuitry coupled to the memory and diagnosing a condition of the storage battery based upon the calculated electrical parameter of the storage battery, the plurality of stored electrical parameters for the plurality of storage batteries, the identification information and the time information; wherein the diagnostic circuitry identifies a peak value of the plurality of stored electrical parameters; and wherein the peak electrical parameter is used as a baseline and diagnostic output from the diagnostic circuitry is based upon a comparison of a current measured electrical parameter to the baseline.
 2. The battery diagnostic system of claim 1 wherein the identification information identifies the set of Kelvin connectors in a plurality of Kelvin connectors to the diagnostic circuitry.
 3. The battery diagnostic system of claim 1 wherein the identification information comprises information which is uniquely associated with one of the storage batteries.
 4. The battery diagnostic system of claim 1 including an input configured to receive the identification information.
 5. The battery diagnostic system of claim 4 wherein the input comprises a manual input.
 6. The battery diagnostic system of claim 4 wherein the input comprises a barcode input.
 7. The battery diagnostic system of claim 4 wherein the input comprises a RFID reader input.
 8. The battery diagnostic system of claim 1 wherein a stored electrical parameter in the memory is overwritten with a newer measured electrical parameter.
 9. The battery diagnostic system of claim 1 wherein the diagnostic circuitry determines a rate of change of a stored electrical parameter based upon the plurality of stored electrical parameters and the time information and responsively provides a diagnostic output.
 10. The battery diagnostic system of claim 9 wherein the diagnostic output comprises an output indicating the storage battery is failing if a rate of change between consecutive measurements is more than 5%.
 11. The battery diagnostic system of claim 1 wherein the diagnostic circuitry provides an output indicative of expected life span of the storage battery.
 12. The battery diagnostic system of claim 1 wherein the plurality of stored electrical parameters comprise dynamic parameters.
 13. A method of diagnosing a battery system comprising a plurality of storage batteries using an electronic battery tester, the method comprising: electrically coupling Kelvin connectors to each of the plurality of storage batteries; applying a forcing function signal from a forcing function source to each of the plurality storage batteries through the respective Kelvin connectors; measuring a response for each of the plurality of the storage batteries for the applied forcing function signal with measurement circuitry; calculating an electrical parameter for each of the plurality of storage batteries based upon the forcing function signal and the measured response; storing each of the calculated electrical parameters in a memory, each of the stored electrical parameters associated with identification information which identifies which of the plurality of storage batteries the measurement was obtained and time information which identifies the time the electrical parameter was obtained; diagnosing a condition of one of the plurality of storage batteries with a microprocessor based upon each of the stored electrical parameters for the plurality of storage batteries, the identification information and the time information; identifying a peak value of a calculated electrical parameter stored in the memory; and using the peak electrical parameter as a baseline and the diagnosing is based upon a comparison of a current measured electrical parameter to the baseline.
 14. The method of diagnosing a battery system of claim 13 wherein the identification information identifies the set of Kelvin connectors in a plurality of Kelvin connectors to the diagnostic circuitry.
 15. The method of diagnosing a battery system of claim 13 wherein the identification information comprises information which is uniquely associated with one of the storage batteries.
 16. The method of diagnosing a battery system of claim 13 including receiving an input related to the identification information.
 17. The method of diagnosing a battery system of claim 13 including overwriting a stored electrical parameter in the memory with a newer measured electrical parameter.
 18. The method of diagnosing a battery system of claim 13 including determining a rate of change of a calculated electrical parameter stored in the memory based upon the plurality of stored electrical parameters and the time information and responsively providing a diagnostic output. 